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Diffstat (limited to 'media/libstagefright/codecs/amrnb/dec/src/post_pro.cpp')
| -rw-r--r-- | media/libstagefright/codecs/amrnb/dec/src/post_pro.cpp | 395 |
1 files changed, 0 insertions, 395 deletions
diff --git a/media/libstagefright/codecs/amrnb/dec/src/post_pro.cpp b/media/libstagefright/codecs/amrnb/dec/src/post_pro.cpp deleted file mode 100644 index ce31793..0000000 --- a/media/libstagefright/codecs/amrnb/dec/src/post_pro.cpp +++ /dev/null @@ -1,395 +0,0 @@ -/* ------------------------------------------------------------------ - * Copyright (C) 1998-2009 PacketVideo - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either - * express or implied. - * See the License for the specific language governing permissions - * and limitations under the License. - * ------------------------------------------------------------------- - */ -/**************************************************************************************** -Portions of this file are derived from the following 3GPP standard: - - 3GPP TS 26.073 - ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec - Available from http://www.3gpp.org - -(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) -Permission to distribute, modify and use this file under the standard license -terms listed above has been obtained from the copyright holder. -****************************************************************************************/ -/* ------------------------------------------------------------------------------- - - - - Pathname: ./audio/gsm-amr/c/src/post_pro.c - Functions: - Post_Process_reset - Post_Process - - Date: 04/03/2000 - ------------------------------------------------------------------------------- - REVISION HISTORY - - Description: Updated template used to PV coding template. First attempt at - optimizing C code. - - Description: Deleted variables listed in the Local Stores Needed/Modified - sections. Optimized the "else" portion of the first "if" - statement in Post_Process function. - - Description: Made grouping more explicit in the calculation of - signal[i] << 1 in the Post_Process function. - - Description: Added setting of Overflow flag in inlined code. - - Description: Synchronized file with UMTS version 3.2.0. Updated coding - template. Removed unnecessary include files. - - Description: Replaced basic_op.h with the header file of the math functions - used in the file. - - Description: Made the following changes per comments from Phase 2/3 review: - 1. Updated copyright year. - 2. Fixed typecasting issue with TI C compiler. - 3. Used short-hand notation for math operations, e.g., "+=", - in the code. - - Description: Removed the functions post_pro_init and post_pro_exit. - The post_pro related structure is no longer dynamically allocated. - - Description: Added pOverflow as a passed in variable as per changes needed - for the EPOC release. - - Description: Optimized file to reduce clock cycle usage. Updated copyright - year and removed unused files in Include section. - - Description: Replaced OSCL mem type functions and eliminated include - files that now are chosen by OSCL definitions - - Description: Replaced "int" and/or "char" with OSCL defined types. - - Description: Changed round function name to pv_round to avoid conflict with - round function in C standard library. - - Description: - ------------------------------------------------------------------------------- - MODULE DESCRIPTION - - This file contains the function that performs post-processing on the output - speech. Post-processing include filtering the output speech through a second - order high pass filter with cutoff frequency of 60 Hz, and up-scaling the - output speech by a factor of 2. In addition to the post-processing function - itself, a post-processing initialization function, post-processing reset - function, and post-processing exit function are also included in this file. - ------------------------------------------------------------------------------- -*/ - - -/*---------------------------------------------------------------------------- -; INCLUDES -----------------------------------------------------------------------------*/ -#include "post_pro.h" -#include "typedef.h" -#include "basic_op.h" - -/*---------------------------------------------------------------------------- -; MACROS -; Define module specific macros here -----------------------------------------------------------------------------*/ - - -/*---------------------------------------------------------------------------- -; DEFINES -; Include all pre-processor statements here. Include conditional -; compile variables also. -----------------------------------------------------------------------------*/ - -/*---------------------------------------------------------------------------- -; LOCAL FUNCTION DEFINITIONS -; Function Prototype declaration -----------------------------------------------------------------------------*/ - -/*---------------------------------------------------------------------------- -; LOCAL VARIABLE DEFINITIONS -; Variable declaration - defined here and used outside this module -----------------------------------------------------------------------------*/ - -/* filter coefficients (fc = 60 Hz) */ -static const Word16 b[3] = {7699, -15398, 7699}; -static const Word16 a[3] = {8192, 15836, -7667}; - -/* ------------------------------------------------------------------------------- - FUNCTION NAME: Post_Process_reset ------------------------------------------------------------------------------- - INPUT AND OUTPUT DEFINITIONS - - Inputs: - state = pointer to a structure of type Post_ProcessState - - Outputs: - structure pointed to by state will have all its fields initialized - to zero - - Returns: - return_value = 0, if reset was successful; -1, otherwise (int) - - Global Variables Used: - None - - Local Variables Needed: - None - ------------------------------------------------------------------------------- - FUNCTION DESCRIPTION - - This function initializes state memory to zero. - ------------------------------------------------------------------------------- - REQUIREMENTS - - None - ------------------------------------------------------------------------------- - REFERENCES - - post_pro.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 - ------------------------------------------------------------------------------- - PSEUDO-CODE - -int Post_Process_reset (Post_ProcessState *state) -{ - if (state == (Post_ProcessState *) NULL){ - fprint(stderr, "Post_Process_reset: invalid parameter\n"); - return -1; - } - - state->y2_hi = 0; - state->y2_lo = 0; - state->y1_hi = 0; - state->y1_lo = 0; - state->x0 = 0; - state->x1 = 0; - - return 0; -} ------------------------------------------------------------------------------- - RESOURCES USED [optional] - - When the code is written for a specific target processor the - the resources used should be documented below. - - HEAP MEMORY USED: x bytes - - STACK MEMORY USED: x bytes - - CLOCK CYCLES: (cycle count equation for this function) + (variable - used to represent cycle count for each subroutine - called) - where: (cycle count variable) = cycle count for [subroutine - name] - ------------------------------------------------------------------------------- - CAUTION [optional] - [State any special notes, constraints or cautions for users of this function] - ------------------------------------------------------------------------------- -*/ - -Word16 Post_Process_reset(Post_ProcessState *state) -{ - if (state == (Post_ProcessState *) NULL) - { - /* fprint(stderr, "Post_Process_reset: invalid parameter\n"); */ - return(-1); - } - - state->y2_hi = 0; - state->y2_lo = 0; - state->y1_hi = 0; - state->y1_lo = 0; - state->x0 = 0; - state->x1 = 0; - - return(0); -} - -/****************************************************************************/ - -/* ------------------------------------------------------------------------------- - FUNCTION NAME: Post_Process ------------------------------------------------------------------------------- - INPUT AND OUTPUT DEFINITIONS - - Inputs: - st = pointer to a structure of type Post_ProcessState - signal = buffer containing the input signal (Word16) - lg = length of the input signal (Word16) - pOverflow = pointer to overflow indicator of type Flag - - Outputs: - structure pointed to by st contains new filter input and output values - signal buffer contains the HP filtered and up-scaled input signal - pOverflow points to 1 if overflow occurs in the math functions called - else it points to 0. - - Returns: - return_value = 0 (int) - - Global Variables Used: - a = buffer containing filter coefficients - b = buffer containing filter coefficients - - Local Variables Needed: - None - ------------------------------------------------------------------------------- - FUNCTION DESCRIPTION - - This function performs post-processing on the output speech signal. First, - the output speech goes through a second order high pass filter with a - cutoff frequency of 60 Hz. Then, the filtered output speech is multiplied - by a factor of 2. The algorithm implemented follows the following difference - equation: - - y[i] = b[0]*x[i]*2 + b[1]*x[i-1]*2 + b[2]*x[i-2]*2 + a[1]*y[i-1] + a[2]*y[i-2]; - ------------------------------------------------------------------------------- - REQUIREMENTS - - None - ------------------------------------------------------------------------------- - REFERENCES - - post_pro.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 - ------------------------------------------------------------------------------- - PSEUDO-CODE - -int Post_Process ( - Post_ProcessState *st, //i/o : post process state - Word16 signal[], //i/o : signal - Word16 lg //i : length of signal - ) -{ - Word16 i, x2; - Word32 L_tmp; - - for (i = 0; i < lg; i++) - { - x2 = st->x1; - st->x1 = st->x0; - st->x0 = signal[i]; - - // y[i] = b[0]*x[i]*2 + b[1]*x[i-1]*2 + b140[2]*x[i-2]/2 - // + a[1]*y[i-1] + a[2] * y[i-2]; - - L_tmp = Mpy_32_16 (st->y1_hi, st->y1_lo, a[1]); - L_tmp = L_add (L_tmp, Mpy_32_16 (st->y2_hi, st->y2_lo, a[2])); - L_tmp = L_mac (L_tmp, st->x0, b[0]); - L_tmp = L_mac (L_tmp, st->x1, b[1]); - L_tmp = L_mac (L_tmp, x2, b[2]); - L_tmp = L_shl (L_tmp, 2); - - //Multiplication by two of output speech with saturation. - signal[i] = pv_round(L_shl(L_tmp, 1)); - - st->y2_hi = st->y1_hi; - st->y2_lo = st->y1_lo; - L_Extract (L_tmp, &st->y1_hi, &st->y1_lo); - } - - return 0; -} - ------------------------------------------------------------------------------- - RESOURCES USED [optional] - - When the code is written for a specific target processor the - the resources used should be documented below. - - HEAP MEMORY USED: x bytes - - STACK MEMORY USED: x bytes - - CLOCK CYCLES: (cycle count equation for this function) + (variable - used to represent cycle count for each subroutine - called) - where: (cycle count variable) = cycle count for [subroutine - name] - ------------------------------------------------------------------------------- - CAUTION [optional] - [State any special notes, constraints or cautions for users of this function] - ------------------------------------------------------------------------------- -*/ - -void Post_Process( - Post_ProcessState *st, /* i/o : post process state */ - Word16 signal[], /* i/o : signal */ - Word16 lg, /* i : length of signal */ - Flag *pOverflow -) -{ - Word16 i, x2; - Word32 L_tmp; - - Word16 *p_signal; - Word16 c_a1 = a[1]; - Word16 c_a2 = a[2]; - Word16 c_b0 = b[0]; - Word16 c_b1 = b[1]; - Word16 c_b2 = b[2]; - - p_signal = &signal[0]; - - for (i = 0; i < lg; i++) - { - x2 = st->x1; - st->x1 = st->x0; - st->x0 = *(p_signal); - - /* y[i] = b[0]*x[i]*2 + b[1]*x[i-1]*2 + b140[2]*x[i-2]/2 */ - /* + a[1]*y[i-1] + a[2] * y[i-2]; */ - - L_tmp = ((Word32) st->y1_hi) * c_a1; - L_tmp += (((Word32) st->y1_lo) * c_a1) >> 15; - L_tmp += ((Word32) st->y2_hi) * c_a2; - L_tmp += (((Word32) st->y2_lo) * c_a2) >> 15; - L_tmp += ((Word32) st->x0) * c_b0; - L_tmp += ((Word32) st->x1) * c_b1; - L_tmp += ((Word32) x2) * c_b2; - L_tmp <<= 3; - - - /* Multiplication by two of output speech with saturation. */ - - *(p_signal++) = pv_round(L_shl(L_tmp, 1, pOverflow), pOverflow); - - st->y2_hi = st->y1_hi; - st->y2_lo = st->y1_lo; - - st->y1_hi = (Word16)(L_tmp >> 16); - st->y1_lo = (Word16)((L_tmp >> 1) - ((Word32) st->y1_hi << 15)); - - } - - return; -} |